Note 8 - Financial Highlights (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Financial Highlights [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Net asset value per Share, beginning of period	$	12.71		$	11.98		$	12.45		$	11.16
Net investment loss (a)		(0.01	)		(0.01	)		(0.02	)		(0.01	)
Net realized and unrealized gain (loss) (b)		(0.70	)		(0.02	)		(0.43	)		0.80
Net increase (decrease) in net assets from operations		(0.71	)		(0.03	)		(0.45	)		0.79
Net asset value per Share, end of period	$	12.00		$	11.95		$	12.00		$	11.95
Total return, at net asset value (c)(d)		(5.59	)%		(0.25	)%		(3.61	)%		7.08	%
Ratio to average net assets:
Net investment loss (e)		(0.25	)%		(0.25	)%		(0.25	)%		(0.25	)%
Expenses (e)		0.25	%		0.25	%		0.25	%		0.25	%